/*
 * Copyright (c) 2023 Hunan OpenValley Digital Industry Development Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export class ByteUtils {
  /**
   * 数字转字节数组（大端）
   * @param num
   * @param byteCount
   * @returns
   */
  static number2BytesBigEndian(num: number, byteCount: number): Uint8Array {
    const byteArray = new Uint8Array(byteCount);

    for (let i = byteCount - 1; i >= 0; i--) {
      byteArray.set([(num >> (8 * i)) & 0xFF], i);
    }

    return byteArray;
  }

  /**
   * 数字转字节数组（小端）
   * @param num
   * @param byteCount
   * @returns
   */
  static number2BytesSmallEndian(num: number, byteCount: number): Uint8Array {
    const byteArray = new Uint8Array(byteCount);

    for (let i = 0; i <= byteCount - 1; i++) {
      byteArray.set([(num >> (8 * i)) & 0xFF], i);
    }

    return byteArray;
  }
}